I have the Speer No. 13 book. Not the newest, but the 62 gr. FMJ is listed in there.
For all of the following loads, cartridge overall length is 2.255 inch.
Speer recommends the 62 gr. bullet only for rifles with twists of 1 turn in 10 inches or faster (1:9 or 1:7). Slower twists will not stabilize this bullet for best accuracy.
Ballistic coefficient for this bullet is 0.307
The first load is the starting load, at which you must start. The second load is maximum and should not be used right off the bat.
Work up to the maximum load -- if you wish -- from the starting load, slowly in increments of 2/10ths of a grain. Remember that maximum loads are often not the most accurate and they don't often offer much of an increase in velocity over loads just below maximum.
Cases were IMI (Israel Military Industries). Military brass is thicker and has less of a volume. If you work up loads with commercial brass, and those loads are near maximum, do NOT switch to military brass without reducing your powder charge.
The commercial .223 pressure limit is 52,000 copper units of pressure. The loads in Speer No. 13 reloading book do not exceed that pressure.
I hasten to warn you of loads found on the internet, many of which have no cited source and are DANGEROUSLY above the safe level.
A few unscrupulous or idiotic reloaders post these loads because they are "safe" in their guns. "Safe" means they didn't blow up their gun --- not yet.
Strained firearms do not always let go on the first, 10th or even 100th shot. But they will let go or be damaged eventually.
ALWAYS check loads on the internet against a reliable, recent reloading book printed by a long-established company. These publishers have access to the latest equipment for measuring pressure. Very few reloaders have access to such equipment; they can only guess at pressures.
If you see an asterisk (*) on the listed powder, it means that Speer used the CCI 450 Magnum primer. If no asterisk is seen, Speer used the regular CCI 400 primer.
On a personal note, I have a Ruger Mini-14 purchased new in 1994 that has a 1:7-inch twist. This rifle is not very accurate with the 55 gr. FMJ but accuracy is improved by using the 62 gr. bullet or Speer's excellent 70 gr. softpoint.
Ruger later changed the twist on its Mini-14 to 1:9 after accuracy complaints.
The culprit is the base of many 55 gr. bullets. If you look at any 10 55 gr. FMJ chosen at random, you will note that the lead protrudes slightly from the base of some, and not others.
This disparity is greatly magnified in the fast 1:7 inch twist, where bullets turn at tens of thousands of RPM.
Switching to a hollowpoint or softnosed bullet improves accuracy, because the base of these bullets is far more uniform.
Wow! Thanks for the complete reply! Even when I'm working from sources published by the component manufacturers, I try to compare the loads from several different sources. Even the Big Boys can make typos. My 11th edition Speer manual has loads listed for the .300 Win mag with 180 grain bullets but someone forgot to print the powder types. I know the max loads are 72.0, 73.0 and 74.0 but it just doesn't say which powder.
Just as a point of interest- my old AR-15 had a 9 inch twist barrel but preferred 55 grainers over the heavier bullets. Go figure.
Well, there's a not-so-technical answer as to why your AR15 with its 1:9 inch twist prefers the 55 gr. bullets.
Unknown to you, you purchased a female gun.
Male guns don't give you near the problems or demonstrate needs and desires so completely contrary to reason, but female guns ... oh my gawwdd.
Little can be done, alas.
You'll have to live with "ARletta 15" and suffer her whims. However, I don't suggest you store her in the closet, or you'll soon notice dozens of shoes clustered around her.
And remember, don't take her target shooting during full moons. Her hormones will be raging then, and your shots will be scattered all over the paper.
Whenever possible, I buy only male guns.
How can you tell? Why, the female guns have bigger butts!
Hmmmm ... gotta run. Seems there's a bunch of women knocking on my door right now ... and they have torches and pitchforks in hand ... wonder what all the commotion is about ...?
I'm interested in reloading once used military brass with a 62 grain bullet. Has anyone had any experience with the new IMR 8208 XBR powder?
I haven't decided on the brand of bullet yet. I plan on reloading for target practice and personal defense. Any suggestions as to loads?
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