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Hi all, just a quick intro,

I'm based just into Northumberland and shoot most species of game. I have a tikka T1x that I fitted a pulsar digisight ultra n450 lrf to shoot bunnies to help my gamekeeper out with I Also have a sako 85m that was fitted with a swarovski z6i for deer stalking. I have fitted a contessa extended rear picatinny in the hope of being able to use both the digisight and swaro (foxes at night deer before)but on my first trip to the pipe range it didn't go well not even getting the digisight on the target (swaro mounts hadn't arrived), not helped by the fact I couldn't get any closer than 100m. Im hoping to get to a field to set them both up soon but anyone have any tips on what to check in the mean time.

TIA
Drew

Big welcome to the forum

Start out with the target at 20m just so you can get on paper. Adjust the scope so it's close to zero at that range and then move back to 100m.
You should now be on paper at 100m so you can then make the final adjustments to get zeroed at that range
To minimise zero shift when swapping scopes you need to develop a procedure that you follow every time you put one of the scopes onto the rifle.
Typically, this might be something like:
1. Put the scope onto the rail and push it forward in the rail. Keep pushing while you tighten the clamps
2. Finger tighten the rear clamp and then the front clamp
3. Tighten the rear clamp to some specific torque and then tighten the front clamp to the same torque

Cheers

Bruce