300 Norma Improved 35 degree
- Thread starter Alex Wheeler
- Start date
Alex Wheeler
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I'd like to run one of those on a scope checker.
Last I heard you were into goat's??
Fainting goats lol
I was able to run N570 up to pressure with 215’s & 230 OTM’s yesterday evening. I typically run 2 shots per charge weight in a pressure ladder at 600+ yds for a hunting rifle and then load up 3 shot groups to bracket the overlap but trying something different with this one to save some time & steps since my work schedule only allows me to make it to hawks ridge 1 day every 2 weeks now.
My local range is close enough to work to give me about 2 hours before sunset so decided to run both tests at 200 yds just to get a rough idea of where I need to load for this weekend.
I will say that i probably wouldn’t waste my time with shooting this close if I didn’t have Alex’s & Rhovee’s posted load data in this thread to give me an idea of where to expect the rifle to tune, but with that being said, I think that I could still see enough separation to know where the groups started to form and then break out of the tune so we’ll find out if that holds true in a day or two. Lol
One of the main reasons that i wanted to post these results is to give people a better idea of what to roughly expect with different barrel lengths for this cartridge and component combos. I believe rhovee’s barrel is 26”, Alex’s 25”, and I had mine finished to 24”. Obviously all these barrels are going to vary some so factor that in when comparing the same combinations between these 3 rifle barrels.
I attached pics of the velocities below and added a couple of trends just for a easy visual.
My local range is close enough to work to give me about 2 hours before sunset so decided to run both tests at 200 yds just to get a rough idea of where I need to load for this weekend.
I will say that i probably wouldn’t waste my time with shooting this close if I didn’t have Alex’s & Rhovee’s posted load data in this thread to give me an idea of where to expect the rifle to tune, but with that being said, I think that I could still see enough separation to know where the groups started to form and then break out of the tune so we’ll find out if that holds true in a day or two. Lol
One of the main reasons that i wanted to post these results is to give people a better idea of what to roughly expect with different barrel lengths for this cartridge and component combos. I believe rhovee’s barrel is 26”, Alex’s 25”, and I had mine finished to 24”. Obviously all these barrels are going to vary some so factor that in when comparing the same combinations between these 3 rifle barrels.
I attached pics of the velocities below and added a couple of trends just for a easy visual.
I never hit pressure.. I didn’t even get an ejector swipe for both tests. That’s just where I decided to load to since this case is new to me.
Will do.. thank you!
Ledd Slinger
Silver $$ Contributor
Be careful with the 230s. Start watching really close for pressure signs up around 91.5gr, especially in a new barrel. The NMI will mask pressure signs pretty well because the brass is so tough. Watch for “slightly” harder bolt lifts. Sometimes you’ll get that just before full pressure where primers flatten or ejector marks are seen.
Dont think I’d go any further on charge weights with the 215s. I was getting 3140 fps with the 215s in a 26” Proof barrel using only 92gr of N570 with my reamer design. And that was before the barrel was broke in and sped up a bit.
If you’re not pressuring up at 93.9gr with the 215, you are probably spitting unburned powder out the muzzle of that shorter barrel. The fact that you only gained 10 fps from 93.3 to 93.9gr is evidence of that. N570 is a little slow for the 215s in a short barrel. Going any further could be dangerous if the full charge weight is able to ignite before the bullet leaves the muzzle. Could be shooting just fine with some rounds then as the barrel heats up, all the sudden one charge gets a full burn and you’ll have on hell of a pressure spike on your hands.
Faster burn rates around H1000, IMR 7977, and N565 will probably be needed to go any faster with the 215
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Alex Wheeler
Site $$ Sponsor
I have been running 92.3 in a 26" Brux with 230s at 3100 fps in a Bat HR. Each barrel is different. This stuff will show ejector marks and stiff bolt like any other case. The brass is tough, real tough though. My last Krieger ran 230s at 3050fps with H1000. Bats are tough too 
Just use your brains and work up carefully.
Just use your brains and work up carefully.
Ledd Slinger
Silver $$ Contributor
Yeah not saying he won’t see pressure signs, but they can come on quick and he’s jumping in .6gr increments. Telling him to start watching at 91.5gr because at that point I would start lowering load work up increments to .2gr or .3gr to be safe. He could be at a point just a touch under max pressure in his barrel with little to no signs, then by jumping another .6gr in weight can put the case into slight over pressure.I have been running 92.3 in a 26" Brux with 230s at 3100 fps in a Bat HR. Each barrel is different. This stuff will show ejector marks and stiff bolt like any other case. The brass is tough, real tough though. My last Krieger ran 230s at 3050fps with H1000. Bats are tough too
As for the 215s, I think his charge weight is high with N570 and he’s entering the danger zone. Not seeing pressure because he’s not getting a full powder burn. If he does get a full powder burn with 94gr of N570 on a hot barrel then things might get ugly. Better to work up the 215s with a faster powder like H1000 where a complete burn is happening behind the lighter bullet in a short barrel so pressure signs are more evident when near or at max.
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Alex Wheeler
Site $$ Sponsor
Max pressure is just a couple inches into the barrel. Thats where pressure signs happen, has nothing to do with full powder burn. Muzzle pressures are low. I dont think that Id try to get to the next node though. If that 24" Krieger will push the 230 at 2980' Id run it there.
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Ledd Slinger
Silver $$ Contributor
Fair enough... Not gonna nit pick little details. The bore right in front of the chamber is where the barrel gets the hottest anyhow. More powder ignites right there in a hot barrel rather than being thrown down the bore then pressures rise. I’ve seen that same exact speed trend using N570 with 200 and 215gr bullets and I know what’s going on when there is very little to no speed gain yet no pressure signs. The main point is that when the chronograph is showing you data like that, its not safe and you should back off.
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