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No worries; that makes sense.
FWIW, for my Ruger 77/44 & its 5/8"x24 threading; the bbl OD at 16.5" was also an insufficient 0.635".
The solution for that situation was to do the bbl threading extra-long at the muzzle; thread on a thread protector all the way down to create a good shoulder (which got faced as well), then turning off the knurling so as to not look /exceedingly/ ugly. Not the most attractive solution by any stretch, but was certainly satisfactory for getting around what would have been a marginal/problematic situation.
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Yeah the little sleeve with a shoulder on it works great! I may do that on the 30-06 barrel if I decide to develop a subsonic load for it, but most subsonic ammo I shoot nowadays is 300 blk or 44 special.
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22" barrel with 1-14 twist is what my 350 RM was and it never had a problem with cast and shot jacketed ok. But now it is a 358 Norma and loves 200 gr cast w/gas check at 2100 fps as well as 250 gr Nosler Partitions at 2750(ouch). I never had any leading with this barrel and it is a Douglas. As far as pistol bullets go--it sprays them into 4 " on a good day. Hope you have better luck if you decide to try them.
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So, I have a barrel on the way ( thanks Kmac) and some gauges, and a barrel wrench, so this project is moving forward! Got a 24" 1 in 14" twist barrel, so i'll try some pistol bullets to see, but probably just gonna throw some heavies around. Get to inlet my stock too for the heavier profile barrel, so fun times ahead!
