Equipment & Gear > Guns and Ammo
IMR 4350
demontang:
Seating depth can be a huge part of the accuracy. I will load about .01 off the lands for my guns and I have both my 243 and 338 shooting well under moa and zero feeding issues. The reloading books should talk about this and tell you how to find your coal for your rifle. Every rifle has different length to the lands and some the mag well is to short to be loaded out that far.
GregMcFadden:
Here is how I approach seating depth.
1. what is the max OAL that fits in the magazine of the rifle (unless you don't mind only having one round loaded at a time)
2. Seat a bullet all the way in to the lands so you know the longest you can be without forcing the bullet into the lands (you can try forcing a few thou of engagement, some rifles and bullets like that, but start below the starting loads if touching or engaging the lands, as the pressures will be higher)
3.
-Usually, this is how I go about finding the optimum seating depth if I am not seating into the lands. I seat to just almost touching the lands (or as long as possible if I need to magazine feed, whichever is shorter), work up a single round for several powder loadings, JUST as a pressure check. if they all check OK I will work up 10 or so rounds for each loading, and shoot for group. best group wins
Now, using that best load, I make 5 more at what I just found was best, and sets of 5 at .020, .040, .060 off the lands and shoot for group. If the best group is acceptable, I stop there and use that load. If I am feeling like a glutton for punishment, I take that OAL and vary the powder load and pick the best group I get out of the bunch, and then go back and vary the OAL about where I previously found my best group in ~.010 increments. (my 30-06 groups best at .028 off the lands for example)
Now, I never EVER use OAL as the measurement that I record, as there is increased error measuring to the tip rather than the ogive. I use the following stuff for my 30-06 (there is a different OAL gauge made for semi-autos that is angled to go thru the ejection port if that is what you need):
http://www.midwayusa.com/viewproduct/?productnumber=231904
http://www.midwayusa.com/viewproduct/?productnumber=570611
http://www.midwayusa.com/viewproduct/?productnumber=761522
BOWHUNTER45:
--- Quote from: JackOfAllTrades on May 11, 2011, 04:29:46 PM ---No offense taken! ;) Often when I'm trying to push a load, I'll drop to less than half grain increments (where I do try to get the most accuracy with the most velocity for a particular bullet, relizing that 'faster, is not always better'.)
Anything less than a 375H&H does not have recoil. :chuckle: :bash: :chuckle:YEAH I agree ..if your just learning take it slow .. I usually find my best loads to be at least 2 gr less than max and nothen walks away from me ..plus I shoot compressed loads which always shoot better but thats a whole nother ball game ..your figure it out and enjoy it once you learn the basics ...good luck ..
-Steve
--- End quote ---
BOWHUNTER45:
One more thing ..I use imr 4350 too but I also love imr 4831 give it a try and you may see a difference in the groups ..
kbrowne14:
I don't have any IMR 4831, but I do have a pound of H4831, I know its not the same, but after I find my most accurate powder load with the IMR 4350, I will do it all over again with the Hodgdons 4831.
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