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180 vs 150

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Honkytonk View Drop Down
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    Posted: November 24 2020 at 6:24am
I have a question for multiple Calibre shooters as the only high power Calibre rifles I have is .303. When I was experimenting with different projectile weights, with a scoped rifle, I found that 180's shot consistently 3" higher than the 150's @ 100 yards. (Scope sighted for 150's) Is this similar with other calibre's? Thanks!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bear43 Quote  Post ReplyReply Direct Link To This Post Posted: November 24 2020 at 7:06am
Pretty much. The heavier projectile takes more time to exit the barrel. Enough to have the barrel climb from the recoil a fraction more and result with a higher impact.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: November 24 2020 at 7:59am
Yup. the barrel vibrations make a big difference.
Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Post Options Post Options   Thanks (1) Thanks(1)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: November 24 2020 at 11:46am
This is well described in Reynolds book, and in later articles he wrote for UK and US NRA magazines.

Both barrel and receiver flexibility (stiffness) play into this as does the location of the barrel bearing in the forend (as that changes barrel harmonics).   My center bedded rifles behave opposite to the muzzle bedded rifles.  I’ve tested this out by running running a range of charge weights in 0.5 gr increments to increase velocity.  

The muzzle bedded No. 1 and No. 4 rifles are said to have “positive compensation”, meaning that slow bullets leave the muzzle at a higher angle of departure.   At short ranges, slow bullets impact the target at a higher elevation, at long range, the slow bullets impact lower on the target (due to trajectory). The range that gives the same POI is known as the “compensation range”, and it somewhere between 600 and 900 yards, depending on the rifle.  The No. 1 rifle generally shows more “positive compensation” than the No. 4. 


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: November 24 2020 at 1:35pm
I wonder how the L39/L42/Envoy/Enforcer behave as they are presumably center bedded if not free floated?
Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AussieShooter Quote  Post ReplyReply Direct Link To This Post Posted: December 08 2020 at 1:54pm
I have a general Ammo question - hopefully I can piggy back on this thread.  I just purchased a 1945 303 with calibrated for HV ammo.  Once my gunsmith clears it for shooting I want to do some plinking - I have an old porthole plate at 100 yards I want to "plink"   What is a good ammo you can recommend.  I have shot the inexpensive WOLF handgun ammo (45ACP) and while fine, it tends to be a little dirty.  Thanks for your input.  Regards,
"Corruptissima re publica plurimae leges" - Tacitus
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Goosic Quote  Post ReplyReply Direct Link To This Post Posted: December 08 2020 at 1:59pm
PPU ammunition is definitely a good choice as is Seller& Belloit  if all you are going to do is plink.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AussieShooter Quote  Post ReplyReply Direct Link To This Post Posted: December 15 2020 at 7:40am
Wow, try finding some 303 british ammo anywhere!    I thought it was just the common sizes but there is an absolute shortage.  I found someone selling PPU on gunbroker and managed to win the auction at about 1.05/round.   A little more then the market price on Cheap Ammo, but the difference is I have ammo :)  Thanks for the advice.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: December 15 2020 at 7:42am
Yeah theres a panic buying spree going on right now because everyone's nervous about the "Pres Almost Elect" Biden"s new EO's coming down the pike in Jan.
Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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