LRP for a Month
 

Well, it has been about a month since the breech plug from PR came to the house. Along with, came the adapters that allowed the use of large rifle primers in the Omega(s). In that time i have tried all kinda loads, primers, and rifles. Whether it is worth the time, monies, and effort, i cannot say. However, it has been instructive.

The latest trial/folly was to use an o-ring under the primer/adapter. The idea came from the use of an o-ring under the a 209 primer in the standard Omega breech plug. Using an o-ring in the standard Omega breech plug, has resulted in a perfect seal between primer, and breech plug. This results in zero blow by, and means the primer seat will never never be flame cut. In order to be able to use an o-ring in a standard Omega breech plug, one needs to make the primer socket deeper. This allows the space for the o-ring. The same is true for the special breech plug from PR.

During the last week, some time was spent looking for an o-ring that would fit the PR breech plug. After a short search, it seemed there was an o-ring available that might work. The package arrived at the house, and indeed it seemed they might work. After measurements were made, the breech plug primer socket was drilled some deeper.

This morning a trip was made to the hills so for to try the modified breech plug, o-ring, primer adapter, and large rifle primer. It was very very muddy because of the prior snow, and current warm wonderful weather. Four wheel drive was necessary to reach a place to set the target. Breeze was negligible, and it was about 55 degrees. Three shots were made from 200 yard. The load in the Dream Season was 110g Blackhorn, 270g Deep Curl, green crush rib sabot, Federal 215 primer.













Of course, there was zero blow by because of the seal made between primer, o-ring, and breech plug. Accuracy was fine. The group size of 2 3/8" isn't a world beater, but it is repeatable. First shot was made from a cold clean barrel, and the forearm of the rifle was rested on my hand, just as it would be whilst hunting. So far, it seems the use of large rifle magnum primers instead of shotgun primers...

I would love to have this group at 200 yds in my MLs. Not that I would have a place to take such a shot. Our woods are very thick around here friend!
As a side note, if you are zeroed at 100 yds, what is your ballistic drop at 200yds for this load Ron?

Actually, i don't know what the drop would be at 200 yard, for this load, if the rifle were sighted in at 100 yard. The chart shows the calculation for a 200 yard zero, for what i guessed is the approximate muzzle velocity for this load.










The chart shows the bullet need be 5.48" high at 100 yard to hit zero at 200 yard. Theoretically what i would do to shoot this rifle/load at 200 yard, is twist the elevation dial up 22 clicks, after it was sighted in at 100 yard. This isn't actually what i did for this particular shooting, because the rifle was kinda already sighted in at 200 yard. What i did do, was fine tune the 200 yard zero, and one day, i turned the elevation dial down 22 clicks to see where it hit at 100 yard. The bullets hit close to zero at 100 yard, but seemed a touch high.

If the scope was left to be zero at 100 yard, i don't really know where the bullets would land at 200 yard.

Ever since the summer 2011, when i started using custom CDS dials from Leupold, i sight all the rifles in at 100 yard. To shoot further, i twist the CDS dial up to the yardage engraved on the dial. For loads without a CDS dial, i twist the elevation dial up the calculated moa. Actually i am quite ignorant of bullet drop, and wouldn't try to shoot deer at long range using a 'guessed holdover'. Following is a chart showing bullet drops when a 100 yard zero is used.












It appears the answer to your question is 11". Sorry, i took so long to arrive at the answer, but i didn't think of how to find it, until i ran out of gas.