Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Testing two rifles, identical chambers ...different barrels
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Black Diamond 408" data-source="post: 111521" data-attributes="member: 1563"><p>Goodgrouper:</p><p></p><p>The main reason for this test was to see what the difference was between both barrels. I used starting loads while fire forming the brass, for this test, it was a hot day and basicly was all that i had loaded up. I have tried faster powders, the case is too big and you will have all kinds of pressure problems. BMG50 powder seems to be one of the best for this cartridge. 141 is a starting load i use for fire forming the cases. i use 147 for my rifle, that puts it just under 3500fps with the 300MK bullet. You can go with a quicker powder with the 250gr bullets, 3700+ fps.</p><p></p><p>I tested some WC873 powder, its a bit dirtier than the BMG but shoots rather well and lower pressure. Like kirby's gun and mine, both are about the same. I used a loading of 145.5 WC873 with the 300mk, 100yd, bug hole. 400yds, 1"</p><p></p><p>Just for testing purposes, 149.5 WC873 with the 250MK, 3/8" group 100yds. 3495fps. Low pressure load, i could bump this up to 152 or more. I will test this one later. </p><p></p><p>There is a big difference between 3075 and 3450, it takes powder to make velocity. 3450 with a 300grn bullet flat out hauls butt. Bug hole groups at 100yds, 400-500yard groupings are under 1"</p><p></p><p>33" bbl burns 99% of the powder according to Quick load,</p><p>150grns of BMG50 powder. The bbl was 35" to start with, no change in velocity after cutting off 2". Kirby is getting almost the same velocity in his 40" tube over my 33" job. His larger action and bbl seems to run a bit lower pressures than my lighter carry rifle. I can get 3520, but the case life will be short. 3450 seems to be about right in my particular rifle. I have 4-5 loadings on 12 pieces of brass i have been testing with, lost none of them. Pockets still hold primers. I did however blow a few pockets working up to see where it tops out at.</p></blockquote><p></p>
[QUOTE="Black Diamond 408, post: 111521, member: 1563"] Goodgrouper: The main reason for this test was to see what the difference was between both barrels. I used starting loads while fire forming the brass, for this test, it was a hot day and basicly was all that i had loaded up. I have tried faster powders, the case is too big and you will have all kinds of pressure problems. BMG50 powder seems to be one of the best for this cartridge. 141 is a starting load i use for fire forming the cases. i use 147 for my rifle, that puts it just under 3500fps with the 300MK bullet. You can go with a quicker powder with the 250gr bullets, 3700+ fps. I tested some WC873 powder, its a bit dirtier than the BMG but shoots rather well and lower pressure. Like kirby's gun and mine, both are about the same. I used a loading of 145.5 WC873 with the 300mk, 100yd, bug hole. 400yds, 1" Just for testing purposes, 149.5 WC873 with the 250MK, 3/8" group 100yds. 3495fps. Low pressure load, i could bump this up to 152 or more. I will test this one later. There is a big difference between 3075 and 3450, it takes powder to make velocity. 3450 with a 300grn bullet flat out hauls butt. Bug hole groups at 100yds, 400-500yard groupings are under 1" 33" bbl burns 99% of the powder according to Quick load, 150grns of BMG50 powder. The bbl was 35" to start with, no change in velocity after cutting off 2". Kirby is getting almost the same velocity in his 40" tube over my 33" job. His larger action and bbl seems to run a bit lower pressures than my lighter carry rifle. I can get 3520, but the case life will be short. 3450 seems to be about right in my particular rifle. I have 4-5 loadings on 12 pieces of brass i have been testing with, lost none of them. Pockets still hold primers. I did however blow a few pockets working up to see where it tops out at. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Testing two rifles, identical chambers ...different barrels
Top