Max load question

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I am reloading 300BLK with Lil'Gun and 220gr Hornady Interlock RN. The Hogdon reloading data only shows one load for 220gr w/Lil'Gun, a max load of 8.4gr to deliver 1062 fps. My velocities are lower, and I think it's because the fat RN profile bullet I'm using engages more rifling than a typical spire point type FMJ .308 bullet so there is more drag (and therefore more pressure).

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My question is, is this the listed max load because considering the cartridge and bullet weight they are trying to keep it subsonic, or is this the max load because higher charges would exceed pressure specs? I'd like to bump up the charge a little but obviously that would be a bad idea if it's the later case. Take baby steps and watch for pressure signs? Nothing so far.

BTW this is for a bolt gun.
 
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I'm currently grinding the flip out of my ramp because of your stupid round nose step children. I'm trying to feed them but they are fighting me every step of the way.
 
How close to 1050 fps are you? I would increase by .1 grains 10 rounds and test for velocity, until I reached 1050 fps.
 
What primer are you using? If using an SR, then try a SRM. That's what Hodgdon's recommend load was using
 
published data is to cover their behinds. and is a good starting point. I'm not telling you it is ok to load double that, but work up a load for your rifle and watch for signs of over pressure.

I love a RNFB for 300blk. I was using a 220gr serria
 
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Just my experience, but you wont see any difference at all, velocity wise, from .1 grain. I'd go up .5, then work my way down if its starts cracking.

Really, when the max load is 8.2 grains, you are going to work up at .5 grains?
 
Really, when the max load is 8.2 grains, you are going to work up at .5 grains?

Yes. Especially with lil gun and a bolt action. I bet 9gr and the primer shows zero pressure signs and the bolt isn't the least bit sticky.
Like backwoodsshooter said above, subsonic loading is a different animal.
The max loadings are often times extremely conservative.
 
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Thanks for all the input. I loaded 5 rds each 8.6 to 9.2 in .2 increments, 20 rounds. Went to my range yesterday and my chrono was dead. Not sure what the problem is but won't power up and there's still juice in the 9 volt. So I didn't shoot those rounds but I'm going to open the thing up and see if it's something simple. When I get a working chrono I'll shoot em and update.
 
I'm currently grinding the flip out of my ramp because of your stupid round nose step children. I'm trying to feed them but they are fighting me every step of the way.
They feed fine in my rifle but sensitive to OAL, meaning they are right there at the lands when I crimp them just above the cannelure.
 
Most if not all of the 300bo published subsonic loads are well under the maximum pressure limits. Just use common sense and work your loads up slowly if you are lookin for more velocity.
 
Most if not all of the 300bo published subsonic loads are well under the maximum pressure limits. Just use common sense and work your loads up slowly if you are lookin for more velocity.
This load was not labeled subsonic per se, but it obviously is.
 
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