By competitive I assume you mean 10m? The next question is how far do you want to take it ? And how much do you have to spend?
Starting at the bottom would be a Gamo Compact £120 -£150, readily available new or second hand
FAS 604 good SSP quality, available second hand only, £300 ish,
Baikal 46m SSP, £250 -£350 available 2nd hand probably the most modern available SSP
Older CO2 pistol by FWB, Walther £200 - £500 99% as good as a modern pistol just £2k less
Second hand pcp, Steyr LP10, Morini, £800 - £1200 2nd hand, not much better than CO2 but pcp
New FWB PX8 £2200 available and you would never have any excuse for an 8

Also you need to try many to see what suits you as they are all different and what suits me perfectly will leave you wondering if you can even hold it.
Bottom line is that the Gamo Compact on are all capable of holding the 10 ring, just some make it easier.
By the best you can then work at it, check out the 10m shooting thread on here for how to advice.
View attachment 685951View attachment 685952View attachment 685953View attachment 685954View attachment 685955View attachment 685956View attachment 685957View attachment 685960