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11-27-2009 11:12 PM
# ADS
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Why the problems with boat tails ? I never shot a other bullet than BT and after thousands of rounds out of all my rifles ( including all my milsurps )there will be no problem. The PRVI ammo is the one that i use in my M1917, and the bore is shiney and looks like new.
Regards
Gunner
Regards Ulrich
Nothing is impossible until you've tried it !
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Legacy Member
Just repeating from what I've read on various sites regarding boat tail bullets and throat wear if I remember right. Apparently a boat tail bullet will not bump up into the rifling like a flat based bullet will and if the boat tail bullet is undersize vs the bore, there is hot gas blow by causing undo wear in the throat. Apparently it's not as big a problem now days with modern powders and from what I understand from the articles, if the bullet/bore fit is good, there no problem, Ray
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Contributing Member
rayg,
one of my comrades had once a problem with his long swede. He used only the original swedish ex military ammo and his bore became a look like it had dandruffs. The steel was destroyed and the experts said it came from the very hot ammo. Not from the bullets, they fitted exactly. So my opinion is similar to yours, the powder is the bigger type of trouble.
Regards
Gunner
Last edited by gunner; 11-28-2009 at 09:39 AM.
Reason: forgot a letter
Regards Ulrich
Nothing is impossible until you've tried it !
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That's been my experiance with two and five groove barrels, Ray. I have also read that two groove barrels are more sensitive to a BTs.
Brad
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Contributing Member
I shoot two of the two grooves. Till now i have no problems. I give my older milsurps once a year for a check to my gunsmith and he said the last time ( February of this year ) they looking much better than the hunters rifles he become for service. Hope that they will stay long in this condition.
Regards
Gunner
Regards Ulrich
Nothing is impossible until you've tried it !
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Advisory Panel
Let me put the boat tail thread to rest. I learned this first hand shooting a Mk.1 Vickers MMG. If your barrel has been broken in and fired extensively with cordite ammo, the hot burning cordite will erode the throat or leade making the use of boat tail Mk.8Z, (boat tail bullet, Nitrocellulose powder), bullets unstable. I had a barrel obviously shot quite a bit with Mk.7 and when I switched to Mk.8Z, the bullets were ALL key holing at 100 yards. I installed/packed a new barrel and broke it in with Mk.8Z and it shot perfectly. The point being that many LE service rifles have been shot extensively with cordite ammo and the flat base Mk.7 bullet is simply going to perform better than the Mk.8 because of the wear present in the throat/leade from cordite. If boat tail bullets are unstable, switch to flat base bullets and the performance will improve.
I've always had good performance from Sierra Pro-Hunter 180 grain soft points, (FB), as I have their 174 grain Match Kings, (BT). The extra expense of the Match Kings simply isn't warranted unless you're shooting an excellent to new condition barrel. Just my 2 cents so take it for what it's worth.
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The Following 3 Members Say Thank You to Brian Dick For This Useful Post:
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Advisory Panel
The basic problem with the anti-boattail faction is that the "blow-by gas cutting" theory of barrel erosion sounds logical but just isn't supported by the extensive tests made over the years by some respected organizations with the resources to fire thousands of rounds through many barrels under controlled conditions. These tests uniformly demonstrate that erosion primarily affects the lands. Grooves remain largely unaffected long after the lands are seriously eroded.
If gas cutting were a significant factor, we would see more erosion in the grooves and less in the lands where the bullet is in full and early contact. Doesn't happen!
The actual mechanism of barrel erosion is well known. Bullet friction and, especially, hot gases following the bullet heat the surface of the barrel interior, causing microscopic cracks and flaking. Subsequent shots carry away little bits of steel, primarily where stress is most pronounced - on the lands close to the chamber.
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The Boattail shape is meant for the round to have better stability at longer ranges and shouldn't have an effect on the barreling. Its an aerodynamic thing.
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Banned