Ihrtuspsa Posted March 11, 2019 Share Posted March 11, 2019 Does anyone know what seat depth for this bullet and weight is equivalent to 124gr fmj in seat depth? If iPad 124 gr fmj to 1.1550 what would the seat depth for berrys flat tip to achieve same case vol? Link to comment Share on other sites More sharing options...
Ihrtuspsa Posted March 12, 2019 Author Share Posted March 12, 2019 Doing some math, if my numbers are correct the case overall with a 124gr berrys thick plate hbfp would be 1.25 that should be the equivalent to a 124gr fmj round nose loaded to 1.1550. Does this sound right? Link to comment Share on other sites More sharing options...
Ihrtuspsa Posted March 12, 2019 Author Share Posted March 12, 2019 Anybody? Looking to work up loads but dont know where to start without col. Link to comment Share on other sites More sharing options...
kneelingatlas Posted March 12, 2019 Share Posted March 12, 2019 What type of pistol? Have you plunk tested any rounds? Link to comment Share on other sites More sharing options...
Harpo Posted March 12, 2019 Share Posted March 12, 2019 Hodgdon shows 1.15" OAL for that bullet in their load data, but doesn't have FMJ data to compare against. I can't tell you the difference in case volume, but if that plunks in your barrel, you can use Hodgdons info to work up your loads for your bullet/powder combination(depending on whose powder you're using, obviously). Link to comment Share on other sites More sharing options...
Ihrtuspsa Posted March 12, 2019 Author Share Posted March 12, 2019 The chamber is reamed very deep so I am more concerned with sufficient neck tension. It would be for a kkm barrel in a glock Link to comment Share on other sites More sharing options...
Ihrtuspsa Posted March 12, 2019 Author Share Posted March 12, 2019 Hodgson's data is for fmj Link to comment Share on other sites More sharing options...
kneelingatlas Posted March 12, 2019 Share Posted March 12, 2019 (edited) You're overthinking this, even if you seat the bullet at such a length where the volume below the bullet is the same, plated bullets typically chrono faster than jacketed. Just back down your charge weight 5-10% load up some rounds and chrono. I shot a thousand of those bullets through my Czechmate loaded 1.10" and they shot fine. The driving factor with that bullet shape is going to be how long they need to be to they feed reliably. Are you loading minor or major? With which powder? It really helps to have all the pertinent information. Edited March 12, 2019 by kneelingatlas Link to comment Share on other sites More sharing options...
Ihrtuspsa Posted March 12, 2019 Author Share Posted March 12, 2019 Awesome thank you I will work up some loads Link to comment Share on other sites More sharing options...
Ihrtuspsa Posted March 13, 2019 Author Share Posted March 13, 2019 Update: the case overall length for these bullets is 1.1030. That is what I settled on after checking the max plunk. Max was at 1.116 in my barrel. Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted March 13, 2019 Share Posted March 13, 2019 If your "max plunk" is 1.116", try the 1.103" OAL, but you might also try a little longer and see if there's any accuracy difference. But, watch your chrono - also check for velocity differences. Since your chamber is "reamed very deep", I'm surprised you can't plunk out to 1.13", which is more common for 9mm minor. ?? Link to comment Share on other sites More sharing options...
kneelingatlas Posted March 13, 2019 Share Posted March 13, 2019 7 hours ago, Ihrtuspsa said: Update: the case overall length for these bullets is 1.1030. That is what I settled on after checking the max plunk. Max was at 1.116 in my barrel. Are you loading minor or major? With which powder? How much? Link to comment Share on other sites More sharing options...
Ihrtuspsa Posted March 13, 2019 Author Share Posted March 13, 2019 Major. Hs6. Worked up loads from 6.8 to 8 gr. I will hit major toward the upper end. Link to comment Share on other sites More sharing options...
Ihrtuspsa Posted March 13, 2019 Author Share Posted March 13, 2019 10 hours ago, Hi-Power Jack said: If your "max plunk" is 1.116", try the 1.103" OAL, but you might also try a little longer and see if there's any accuracy difference. But, watch your chrono - also check for velocity differences. Since your chamber is "reamed very deep", I'm surprised you can't plunk out to 1.13", which is more common for 9mm minor. ?? Uh..I'm using a FLAT POINT...I load round nose to 1.1650...?? Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted March 13, 2019 Share Posted March 13, 2019 Oops, I missed that Link to comment Share on other sites More sharing options...
Ihrtuspsa Posted March 13, 2019 Author Share Posted March 13, 2019 It's all good Link to comment Share on other sites More sharing options...
Ihrtuspsa Posted March 14, 2019 Author Share Posted March 14, 2019 So I chronod these loads. They felt softer than 124gr fmj rn...like by a lot. However my pile of s#!t Caldwell chrono hasnt worked from day one, only sometimes it reads correctly pretty frustrating since it costs me ammo and time, but nevertheless heres the results. I achieved 168pf at the 7.6gr mark. But I dont know if I trust it so I will try another chronograph. I shut it off and shot the rest of the rounds at 7.8, 7.9, and 8.0 and there were no pressure signs at all. Even the primers still had roundness..I was suprised. So if I have 168pf at 7.6 then I can comfortably and safely run out to approximately 176 of to work that comp better. Tomorrow I will try again. Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted March 14, 2019 Share Posted March 14, 2019 BTW, I stopped using FMJ's for Major after my comp got plugged with deposits (Lead). I use only bullets that are completely covered in copper and I don't have to scrub my comp any more If you're going to use FMJ's (no real good reason to), spray your comp before each use, and clean it out when you get home - saves some work down the road. Link to comment Share on other sites More sharing options...
Ihrtuspsa Posted March 15, 2019 Author Share Posted March 15, 2019 That's why when you clean your guns like you should you use a dental pic to scrape that s#!t Link to comment Share on other sites More sharing options...
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