Author Topic: Big Bore Barrel Length  (Read 169 times)

watersteps

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Big Bore Barrel Length
« on: January 13, 2022, 09:42:56 AM »
When looking for a big bore air rifle, would the longer barrel be more accurate then a short one? Also would a .30 cal be accurate then a .50 cal rifle?  I'm looking at 50 to 100 yards.


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steveoh

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Re: Big Bore Barrel Length
« Reply #1 on: January 13, 2022, 10:21:38 AM »
When looking for a big bore air rifle, would the longer barrel be more accurate then a short one? Also would a .30 cal be accurate then a .50 cal rifle?  I'm looking at 50 to 100 yards.

It's my experience that long barrels equate a greater possibility of more muzzle velocity. Accuracy might be enhanced if trajectory is flatter.

I find it easier to get a smaller bore to be more accurate, but that's no guarantee. The larger the caliber the more power you will need to get desire velocity. My DAQ .458 with a light bullet can whack a 5" steel plate at 100 yards, shot after shot. I found the sweet spot for that. I can also do the same with my Airforce Texan. But, the Texan takes way less power and air to launch a 72 grain bullet than the the DAQ does for a 220grain bullet. I can easily get either rifle to a desired velocity of 980fps or so. Then the trajectory is similar, and the steel makes sound from either rifle, and I giggle. 

With the .257 Texan I can shoot all day long on 2800 psi fills from my larger SCBA Bottle. I can also get a reasonable 10-12 accurate shots per fill. The DAQ at 3,000-3300psi sucks air out of the same tank at a sobering rate. I get two good shots and one follow up shot with the DAQ. The DAQ is punishing, whereas the Texan is just plain easy to shoot, and I don't get nearly as worn-out or sore.

50-100yards is doable with both calibers. All depends on what you are shooting at. If you are hitting steel, or shooting small game such as turkeys or coyotes then I'd go with .257. If you are shooting pigs, deer, etc, then I'd go .458 / .50, though a powerful Texan .308 will do the job, and .257 will probably work as well. .50 caliber is huge compared to .30.

Oh, and the cost of lead is a huge difference. Lot of considerations.

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Alan

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Re: Big Bore Barrel Length
« Reply #2 on: January 13, 2022, 11:30:34 AM »
One of the most important PCP tuning goals, is to use just enough air to achieve the power level you're striving for. In other words, efficiency.

If I had to guess which caliber is most efficiency (power vs. air used), I'd vote for .25 caliber being the best overall. I say this for several reasons. One is, it turns out, the most efficient firearm (powder load vs. muzzle energy) is a .257 Roberts AI. Others come close, but don't win any cigars. And based on this, what do you think the optimal barrel length is for a .257 Robert AI? The answer is 24 inches. Which, by the way, is 609 mm or very close to the average airgun barrel length.

I wonder what Bob Sterne has to say about this?
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Alan

I have a Hill EC-3000 compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your tank as a courtesy (4,250 PSI limit).

watersteps

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Re: Big Bore Barrel Length
« Reply #3 on: January 13, 2022, 01:30:42 PM »
Thanks Guys, I'm shooting at targets, deer, any coyotes that may wonder in and ground hogs. I must have enough power to kill deer at 50 to 75 yards. If I stay at the .45 size there may be a lot more bullets to choice from. So if I choose a .45 rifle the longer barrel may be better???
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Nomadic Pirate

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Re: Big Bore Barrel Length
« Reply #4 on: January 13, 2022, 02:10:49 PM »
Longer barrel definitely gives you more power however I believe shorter barrels are more accurate,....why ?

At the relative slow speeds we shoot Airguns follow through is important and a longer barrel gives you more time to do something wrong  ;D

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Steelhead

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Re: Big Bore Barrel Length
« Reply #5 on: January 13, 2022, 02:26:48 PM »
I agree with Nomadic Pirate for sure. Long barrels are more 'hold sensitive' for sure. The biggest thing Watersteps mentioned was the range he would be shootiong at. That's a relatively short distance (50 to 100) yards and any tuned/practiced/right ammo big bore should be able to be shoot tight all day at those ranges. However, some not much out of the box. It took a long time to tame my .308 into good groups and I still haven't deep into the .50 yet. Currently I'm around 4" at 50 yards with it, but it's new and only about 30 shots through it, nor have I started casting/sizing bullets for it yet.

As far as .30 vs. .50 in the accuracy department; the .30 has it over the .50 in spades. Just due to the physics of .30 and the number of bullet options available alone make it a better choice. It's about 1/5 of the cost to shoot too. I'm on steel to 300 yards all day long with no scope tilt. None of the other calibers (with the exception of the .257) can do that, nor are they as accurate. What you give up in 'whack-ability' with the bigger calibers, you make up for in shot count, flat trajectory, consistency, and cost reduction with the .30.
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Re: Big Bore Barrel Length
« Reply #6 on: January 13, 2022, 09:32:14 PM »
For the same pressure, a longer barrel length gives more power.... Accuracy, however, has little to do with barrel length, in fact longer barrels tend to flex more and that may lead to poorer accuracy, but not necessarily....

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watersteps

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Re: Big Bore Barrel Length
« Reply #7 on: January 14, 2022, 07:40:19 AM »
Well Guys Thanks a Lot for the info. I can now sit down and go over the info and pick a good big bore for my needs.
Regular barrel length is OK.
Somewhere between .35 and .45 cal for deer hunting and maybe coyotes.
Would like to have a full stock, wood or synthetic.
Removeable air cylinder would be a plus.
Single shot or repeater is fine.
Easy working bolt action or a side lever action.
Medium noise level would be nice.
Price under a $1,000.00.
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Nomadic Pirate

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Re: Big Bore Barrel Length
« Reply #8 on: January 14, 2022, 08:49:38 AM »
Get that Winchester .45,
 Evanix guns and that platform been out a long time, Neil Clauge makes great Silencers for them and if need tuning Will Piatt in NC knows those guns inside out.
Evanix REX Carbine             .357  180 FPE  #6.1
Evanix REX Mini-Carbine      .357  150 FPE  #5.2
Evanix REX Mini-Carbine II   .357  150 FPE  #5.1
Evanix RainStorm  II            .30  100 FPE  #9.5
Evanix RainStorm  II            .30   85  FPE  #9.3
Evanix Storm Bushgun          .30   70  FPE  #7.0
Evanix MAX-ML                     .25   65  FPE  #10.6
Evanix RainStorm II              .25   55  FPE  #9.0
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steveoh

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Re: Big Bore Barrel Length
« Reply #9 on: January 14, 2022, 08:58:16 AM »
Well Guys Thanks a Lot for the info. I can now sit down and go over the info and pick a good big bore for my needs.
Regular barrel length is OK.
Somewhere between .35 and .45 cal for deer hunting and maybe coyotes.
Would like to have a full stock, wood or synthetic.
Removeable air cylinder would be a plus.
Single shot or repeater is fine.
Easy working bolt action or a side lever action.
Medium noise level would be nice.
Price under a $1,000.00.
Yes and I believe in Santa Clause.

If you a full day of fun, make sure you save money for one or three big SCBA tanks and a compressor.

Don’t forget cleaning rod, patches and a good bore cleaner, as well as brushes. Then lube barrel and ammo. Some barrels are super rough and contribute to fouling, so some JB Bore Paste should be in your tool kit also. :)
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watersteps

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Re: Big Bore Barrel Length
« Reply #10 on: January 14, 2022, 10:56:14 AM »
I got the compressor and cleaning rods in house right now. SCBA bottle, I'm working on. Will need to find the bore cleaner and the lube after I get the rifle.
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Steelhead

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Re: Big Bore Barrel Length
« Reply #11 on: January 15, 2022, 07:02:18 AM »
Bore cleaner and lube...easy. I've had great luck with Shooter's Choice Lead Remover. It's not nearly as harsh as some of the other cleaners that works for copper (i.e. Sweet's) and does a wonderful job. For lube, you can't go wrong with 10 wt. silicone shock oil for rc cars. Both are proven winners across the board. I'm sure others will have input on choices as well and I know that multiple things work, but these two have covered all of the bases for me for years.

https://www.amazon.com/Shooters-Choice-Remover-LRS04-Black/dp/B0002INWI2/ref=sr_1_3?crid=2AG4915FJV5Q9&keywords=shooter+choice+lead&qid=1642258850&sprefix=shooter+choice%2Caps%2C1558&sr=8-3

https://www.amazon.com/Team-Associated-Weight-Silicone-2-Ounce/dp/B0006MZSSG/ref=sr_1_1?crid=37TG6DPTBXUNE&keywords=10+wt.+rc+shock+oil&qid=1642258911&sprefix=10+wt.+rs+shock+o%2Caps%2C944&sr=8-1
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watersteps

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Re: Big Bore Barrel Length
« Reply #12 on: January 15, 2022, 10:23:43 AM »
Thanks steelhead
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