TJART Posted December 30, 2015 Share Posted December 30, 2015 147gn xtreames, 3.4gn TG, 9mm My manual says 1.115 - and for some reason, I sat them at about 1.10 and some change. Am I spending my day pulling bullet tomorrow, or am I good to go? Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted December 30, 2015 Share Posted December 30, 2015 Take the barrel out of your gun, and DROP a cartridge into the chamber. It should "PLUNK" as it goes in, to indicate that it has hit bottom and is fully in the chamber. If you can turn it freely and it easily drops out of the chamber when you invert the barrel, you're probably good to go, if the rounds fit thru your mag. Link to comment Share on other sites More sharing options...
peterthefish Posted December 30, 2015 Share Posted December 30, 2015 I'm gonna guess your manual has 147 GR data but not for Xtremes. Apples to Oranges. Link to comment Share on other sites More sharing options...
kevin c Posted December 31, 2015 Share Posted December 31, 2015 If you're worried about pressure you can measure the length of the Xtreme bullet you are using (get an average from a good sample). Compare that to the length of the bullet described in the manual. At the same C.O.A.L, if your bullet is longer then you have less internal volume for any given powder charge than the reference bullet and will have higher (perhaps dangerously higher) pressure. If your bullet is shorter than the reference bullet you will have more internal volume and less pressure. If your bullet is 0.005" shorter than the reference bullet, you can be 0.005" shorter in C.O.A.L. and still have the same volume internally for the same powder charge and the same pressure. If your bullet is 0.005" longer, than your round needs to be that much longer than the reference round to have the same internal volume for the powder charge. IMPORTANT CAVEAT: The above assumes that both bullets have smooth flat bases. If the bullet bases are different (I've seen CMJ, FMJ with a cavity left in the base that the jacket and core did not fill in, concave, convex and beveled base), than all bets are off and no conclusions should be drawn. Link to comment Share on other sites More sharing options...
TJART Posted December 31, 2015 Author Share Posted December 31, 2015 Okay; My SP01 plunks at 1.20" - .015 gives me 1.185" I'm going to load 3.3gn Titegroup at 1.160" OAL and see where it gets me. Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted December 31, 2015 Share Posted December 31, 2015 (edited) My SP01 plunks at 1.20" I don't own a SP01, but I doubt you could load that long for it ... And feed thru your mags. At very least, I'd suggest you go back and re-measure that. You're correct that backing off it a bit is a good idea. Good luck with it. Edited December 31, 2015 by Hi-Power Jack Link to comment Share on other sites More sharing options...
justpaul Posted January 1, 2016 Share Posted January 1, 2016 1.10 to 1.13 is normally really close for Cz using extreme 147 rn Link to comment Share on other sites More sharing options...
TJART Posted January 1, 2016 Author Share Posted January 1, 2016 I pulled 'em, and re-seated at 1.15X-1.14X (different head stamps) Will report back. Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted January 1, 2016 Share Posted January 1, 2016 I re-seated at 1.15X How did the PLUNK at 1.15" ? Link to comment Share on other sites More sharing options...
TJART Posted January 2, 2016 Author Share Posted January 2, 2016 I re-seated at 1.15X How did the PLUNK at 1.15" ? ran 210 seated at 1.14X-1.15X and all feed and fired flawless. 3.3g titegroup. all is well in the world now. Link to comment Share on other sites More sharing options...
wyliearms Posted January 28, 2016 Share Posted January 28, 2016 I run mine around 1.180. 147 Xtremes... Link to comment Share on other sites More sharing options...
GJGary Posted January 30, 2016 Share Posted January 30, 2016 147 rn xtremes 75b and sp01s 1.135oal for me. Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted January 30, 2016 Share Posted January 30, 2016 I run mine around 1.180. Is this a typo? 1.18" in 9mm? Link to comment Share on other sites More sharing options...
Vassago Posted January 30, 2016 Share Posted January 30, 2016 My AET barrels will accomodate even longer than 1.18" in 9mm. I have used that lenght with N310 and 147's grainers. Link to comment Share on other sites More sharing options...
wav3rhythm Posted January 30, 2016 Share Posted January 30, 2016 I had to load to 1.10 with 147gn Missouri bullets before I got my chamber reamed. I was constantly battling signs of over pressure. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
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