210M worked the best in my gun also.In my 300 wm hodgdon 4831sc always gave me the best Chrono numbers, then H 1000 following that. Also when I switched from Fed 215 primers to Fed 210 primers my ES improved significantly
210M worked the best in my gun also.In my 300 wm hodgdon 4831sc always gave me the best Chrono numbers, then H 1000 following that. Also when I switched from Fed 215 primers to Fed 210 primers my ES improved significantly
I also find that interesting....Yes, if you can believe it my velocity went up 20fps. It was crazy. Verified the test over 20-30 rounds to make sure it wasn't a fluke
The magnum primers were not around when the 300WM was developed, the standards primers is what that round was designed for in the beginning. The powders have come along way also since the 60's.Interesting so switching to a non magnum primer improved your ES, was there any velocity change?
Yes, if you can believe it my velocity went up 20fps. It was crazy. Verified the test over 20-30 rounds to make sure it wasn't a fluke
Been banging my head on the wall trying to improve the ES and SD on my 300 WM.
All brass prepared and trimmed properly,full length sized, mandrel sized necks, primed with federal LRM primers, all charges weighed on digital and 10-10 scale and were as perfect to the tenth of a grain as I could get them, bullets seated on lee die and all measured to ogive for OAL very consistent lengths. All cases water checked and all were with 1 grn of each between the highest and lowest capacity cases (the deviated shots for high or low extreme spread weren't in the cases with 1 grn off volume). All measured for concentricity and worst was .005 on bullet near tip, the concentricity again didnt seem to be the ones that were low or high on ES.
Tried h4350 with some barnes 180 ttsx and accuracy was horrible however just likely needed OAL adjusted, did the 10 shot method goin .2 at a time after working up safely of course and picked best node and the 5 and 10 shot ES and SD was bad tried a few other charges right in that charge area flat spot. ES was around 60 and SD around 20
Wanting more precision I also tried H414 (didn't wanna burn up the 4350) and some Hornady 168 match, same prep and load workup ES around 70 on a ten shot group after getting the best place on node and SD right around 20. These were accurate at 100 yards even without adjusting OAL
So my question is to really lower those numbers should i look back to my process or more to the powder?
I lubed neck lightly for mandrel sizing withlee case lube. When trimming i use a qtip with alcohol on each neck to remove lube etcI agree with trying H1000 instead, but I had another question. Do you get your brass squeaky clean before loading? In particular, is the inside of the neck VERY clran?
Your the second to suggest non magnum primers, Im gonna try it for sure, im down to the last few magnum primers anywaysTry CCI-250's as well, I shoot rl26 in my 300 wm with 215gr hybrids and I got significantly better SD/ES with CCI vs the Federal 215m.
I had the same discovery with my 7 SAUM and using Federal 210m primers over a magnum primer, both with H1000 and RL26.
*I have several shooting buddies who have had the exact same discovery. Most of us don't use the 215m primer unless it's in the really big magnum's - Ultra mags, Normas and Lapua.
TBH i just seated same depth as similar factory ammo for testing purposes, was tryingto tune ES and SD before adjusting seatingWhat kind of seating depth are you playing with?
As far as neck tension im using a PMA tool expander mandrel as a seperate step, i would think it would be pretty uniform?+1. Powder, neck tension and primer.
I d personally use a powder that s giving 95-100 % fill also.
Where did you find the ONLINE TARGET?
Do you do any case cleaning before resizing and then expanding?I lubed neck lightly for mandrel sizing withlee case lube. When trimming i use a qtip with alcohol on each neck to remove lube etc
You might see some improvements in your ES and SD with different seating depths. Not sure where you are at now, but play around with jumping in increments of .015" or .020" with 5 rounds per depth and you might find a place where your pressures/velocity are more consistent.TBH i just seated same depth as similar factory ammo for testing purposes, was tryingto tune ES and SD before adjusting seating