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Post by sew on Sept 21, 2022 12:42:59 GMT -5
Interesting about the fouling with the Fed 215m.
In the early days of testing the Sav 10ML when we were trying different 209 primers, the Fed 209s would move our saboted 250XTPs a little farther down the barrel than any other mainstream primers. Maybe Cheddar went a little farther. We measured both how far the bullet went down the barrel and the breech plug (BP) fouling.
The Win 209s moved the bullets almost as far but with a lot less BP fouling. Therefore, I NEVER used Fed 209s in my testing nor subsequent shooting. I just stayed with Winchester 209s. Federal primers have just seemed dirtier to me.
For my “real” smokeless MLers, I’m using WLRM primers but see little difference with just plain WLR primers. Possibly, my lower powder loads, in some cases, faster powders, and using DI makes the ignition enough easier that the difference in regular and magnum is insignificant.
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Post by ballistic on Sept 21, 2022 16:14:14 GMT -5
Interesting about the fouling with the Fed 215m. In the early days of testing the Sav 10ML when we were trying different 209 primers, the Fed 209s would move our saboted 250XTPs a little farther down the barrel than any other mainstream primers. Maybe Cheddar went a little farther. We measured both how far the bullet went down the barrel and the breech plug (BP) fouling. The Win 209s moved the bullets almost as far but with a lot less BP fouling. Therefore, I NEVER used Fed 209s in my testing nor subsequent shooting. I just stayed with Winchester 209s. Federal primers have just seemed dirtier to me. For my “real” smokeless MLers, I’m using WLRM primers but see little difference with just plain WLR primers. Possibly, my lower powder loads, in some cases, faster powders, and using DI makes the ignition enough easier that the difference in regular and magnum is insignificant. Just want to make it clear that I like fed215 magnum primers and almost every brand of primer has worked really well in center fires for me. The previous post was just to show that my .40 takes a combo of primer and powder to burn cleanly. Just a few grains out and a fed 215 primer -resulted in a combo that fouled the barrel badly. And honestly - I would have thought the magnum primer and 2 grains less powder to be cleaner…….. but it fouled the middle of the barrel really bad. Picky .40,s
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Post by hillbill on Sept 21, 2022 17:29:15 GMT -5
Picky they are but once you get them tuned in they are long range lasers.
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Post by Sideshow on Aug 21, 2023 20:27:17 GMT -5
Steve Just throwing ideas out there. Hoping to stumble on something you hadn’t thought of. Sounds like you have it covered. I wish you luck but assume you won’t need it. Joelmoney , Balistic , Sew & Others i figured id share a recent finding about a 40s bore and groove dimmensions that you long range boys could use to help you or reduced load guys too . Bestill uses a .400/404 in his long range competition barrels . It even works for his paper patched much harder lead 420gr bh209 loads to achieve complete obturation / seal . He must use hard lead to prevent nose slump when shot . I noticed in my barrel 400/408 that copper would deposit on the sides of the lands but never on the bottom of a groove most prevelant if the load is dirty . I think my theory with insufficent obturation partly due to groove depth is correct by what Bestill has done to help himself jacketed or PP . Makes sense to me anyway . Velocity per grain is also improved for powder . Less bullet distortion should also yield better bc . Doc White used the Same Approach with his "slip fit" conical throwers & blk powder, just a bit deeper grooves . It still applies today . I figured you might like to know this . Oh yea i misspoke on pittman jacket thickness on the 40 . Its .025" as you probably already know . Hope this helps on a new barrel or build . Even a reduced load gun would benefit with this , i believe perhaps the most . Bestill makes his Omega SML conversions now the same way , .450/.454 only offered in 45 for the same reason with its thinner barrel . 60g 4198 and a 275gr bullet = 2620 . Less powder , Less Pressure , Same Speed as 450/458 65gr & a 275. I guess the 40 experiment continues as we learn its ways . - Bob Ps .-- i put this here rather than a new thread . It belonged here i felt .
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