Tips on Regulating a Combo Gun with Adjustable bottom Rifle Barrel

[dougk]

Pierre asked a great question in another thread about regulating a combo gun with a shotgun over an adjustable rifle barrel.

The following are the steps I have found that have worked for me.

1. Sight the scope to the yardage and load you want in the shotgun, for example 2.75 inch  Brenneke Black Magic slug at 75 yards

2. Shoot the rifle to determine the delta. Use a marker to mark the original setting.

3. Adjust the bottom barrel elevation to the range and load, for example 180gr Norma Oryx zeroed at 100 yards.  This adjustment can be challenging.  I found using a marker to mark the initial settings and each additional setting provides useful reference points.  If the first shot is 4 inches low at 100 yrds and the next shot, after adjusting the elevation of the bottom barrel  is 4 inches high, then you know to split the difference between the 2 marks to be at zero at 100 yeards

Hope this helps.

Doug

[Dalgo]

Doug,


Absolutely!  Thank you very much! It has factory 'witness' marks for 100 yds, more or less (or is it meters), and for 0 in. windage, so just making marks and going accordingly will work great. Thanks, again.


Pierre